Automatic shut-off for gas-burners.



W. M. WOOD.

AUTOMATIC SHUT-OFF FOR GAS BURNERS.

APPLlcAHoN FILED JUNE 8. |916.

1,242,408. Patented ocr. 9, 1917.

2 SHEETS-SHUT l.

W. M. WOOD.

AUTOMATIC SHUT-OFF FOR GAS BURNERS.

APPLICATION FILED JUNE 8,'1916.

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i 'f w" MUSGRAVE WOOD, 0F PHILADELPHIA, PENNSYLVANIA, ASSIG'NOR T0 THE UNITED GAS IMPROVEMENT COMPANY, OF PHILADELPHIA PENNSYLVANIA, .A

CORPORATION 0F PENNSYLVANIA.

AUTOMATIC SHUT-OFF FOR GAS-BURNERS.

Specication of Letters Patent.

Application lcd J'une 8, 1916. Serial No. 102,545.

To all 'whom z't may concern:

Be it known that I, WILLIAM Muscnevn Woon, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Automatic Shut-Oli' for Gas-Burners, of which the following is a. specification.

There are many machines in which materials are exposed to the flames of gas-burners for various purposes, such as singeing dispelling electricity and the like, and these materials can be injured or set on re by unduly prolonging the application to'them of heat. Such materials are likely to be unduly exposed to heat in the event of the accidental stoppage of the machines and in such case the danger of setting them on lire constitutes a serious fire hazard. For thev sake of a more concrete example it may be said that in use a dispelling gas-burner is attached to or mounted on a reciprocating mechanism-such as a delivery carriagewhich passes from under sheets ofpaper and delivers them, one at a time, in a pile, and the function of this burner is to apply the heat of a flame to each sheet of paper while the mechanism is passing from under and delivering it, in order to dispel the e'ect of static electricity and so permit the pile of sheets to be made true. With such burners as heretofore constructed and operated, such mechanism presented a tire hazard of such importance that insurance rates must be necessarily high.

It is the principal object of the present invention -lto obviate this re hazard and so make the use of such machinery not only safe but also .economical in respect to the insurance rates and gas consumption.

The invention, generally stated, consists in the combination with such a burner and its valve, of a pilot light, and a pendulum device operated by the reciprocation of the mechanism and adapted to automatically turn on the gas to the burner only when a sheet of paper is being delivered to the pile and to turn oi the gas during all other movements and in the event of stoppage of the machinery. The invention further consists in the provision of means for guarding the paper in respect to the pilot lights and in the improvements to be presently described and finally claimed.

The invention broadly stated consists in an automatic shut-ofi for gas-burners provided with a valve having means tending to close it and shut oii" the gas, combined with devices adapted to normally restrain such action of said means While the material treated and the burner are-in proper relative motion. The invention further comprises the improvements to be presently described and nally claim d.l

The invention will be described in connection with the embodiment of it chosen for illustration in the accompanying drawings forming part hereof, and in Which- Figure 1, is a diagrammatic side view illustrative of the invention in application to sheet piling mechanism.

Fig. 2, is a diagrammatic top view showmgvalming mechanism.

1g. 3, is a side elevation of mechanism embodying features of the invention.

gig. 4, is an end view, partly in section, an

Fig. 5, is a detail view, drawn to an enlarged scale.

In the drawings 1 is the valve for the gas supply to the burner 2. This valve is shown as of the puppet variety and its seat 3 forms part of a lspider 4 which serves as a guide forthe stem 5 of the valve and also as a support for a spring 6 which operates to normally close the valve. The spider 4 is interposed in the gas-Way 7 and as shown this is accomplished by making the latter in two 4ing these parts the spider can be removed in order to repair any of the parts which it carries. Above the spider there is a gas olf-take 8 that leads to the pilot light 9. Gas from the gas-way 7 is discharged by the jet device 10 into the mixing chamber 11 of the burner 2 and air is admitted to the mixing chamber by an adjustable shutter 12. 13 is a cam shaft journaled in a bearing 15 in the gas-way 7 and also in a bearin bracket 16, which is generally L-s aped and projects back from the plane of the paper in Fig. 4 and across to the back of the gas-Way 7 to which it is secured. This is indicated in Fig. 1. On this shaft 13 is mounted a 14inaslots 19. rllhe pendulum bar 2O is mounted loose on the shaft 13 but is connected with the plate 18 by screws adjustable in the openings 19, so that while the valve moves when the pendulum arm 20 swings, the angular relation of the cam and bar is adjustable. 21 and 22 are the pendulum weights, and the weight 21 is shown as adjustable. I1`Wo weights are shown, one above and one below the fulcrum of the pendulum and this is done because it makes the pendulum swing at the operating speed of the delivery carriage or reciprocating mechanism and slower than it would do if the upper weight were omitted, but the upper .weight is not in all cases essential. 23 is a stop for limiting the swing of the pendulum in one direction and it is shown to comprise the end of an adjustable screw. 24C is a frame by means of which the device is attached to the reciprocating member or carriage 25, or to some other appropriate part of the mechanism to which the device of the invention is to be applied. 26 is a shroud that is secured to the frame 24: and extends over the pilot light and depends as at 27 and 28 so as to cover it from the top While at the same time adording suiicient air from the bottom to support combustion. The gas-way 7 is connected as by means of a flexible connection or hose 29 with a gas supply 30.

1n describing the mode of operation of the automatic shut-oli for gas-burners reference will be made to a dispelling burner and in a general way to certain parts of a mechanism with which a dispelling burner is employed, but it must be borne in mind that the mechanism referred to is but a type of means by which material treated is presented to the gas llames of burners.

The device shown in Figs. 3 and 4 and above described is mounted on the reciproeating carriage 25, or more accurately, in such a way that it is located to one side of the carriage, while the burner 2 extends crosswise of the carriage. The carriage is provided with rails or lingers 31 and it is reciprocated from left to right in Fig. 1 on tracks 32. When the carriage is in its extreme right-hand position beyond the sheet toward the right, a sheet of paper is delivered to it and it carries this sheet toward the left into the position shown in Fig. 1. Then certain stops 33 are brought into action between the rails 31 so that as the carriage moves again toward the right, these stops hold the sheet while the carriage travels toward the right whereupon the sheet drops on the pile as is indicated by the dotted lines 34: in Fig. 1. The devices 35 approach and recede from the center of the pile and serve to aline the sheets in the pile. The device and operation last described do not constitute the present invention but serve to facilitate a description of the operation of Leganes one form of apparatus which does embody the invention. Upon the arival of the carriage 25 in its extreme left-hand position the pendulum device swings into valve-opening position, as shown at the left-hand side of Fig. 1, thus the valve 1 is opened, a supply of gas reaches the burner 2 and is ignited by the pilot light. rllhe carriage 25 immediately begins its return travel toward the right, in Fig. 1, and during the completion of this return travel the pendulum keeps the valve 1"'open so that the burner is lighted as it travels u nder the sheet of paper. As soon as the carriage 25 reaches its right-hand position, Fig. 1, the pendulum swings into valve-closing position, as shown at the righthand side ot Fig. 1, and it remains in that position during the left-hand travel of the carriage in Fig. 1, so that the main burner is extinguished during the left-hand travel of the carriage. Should the carriage stop, it is evident that the swing of the pendulum will let the valve 1 come to closed position. The stop 23 operates to limit the swing of the pendulum into valve-closing position, so that on the return swing it cannot swing high enough to reach valve-opening position. lln fact the pendulum can only swing high enough to reach valve opening position when the parts are in the position shown at the left-hand sideof Fig. 1 and the time occupied by the pendulum in swinging from that highest position suficiently to permit the valve 1 to close, is the time occupied by the completion of a right-hand stroke of the carriage in Fig. 1.

llt will be understood `that the edge of the paper passes to the left of the part 27 of the shroud in Fig. 4 and that the shroud prevents it from reaching the pilot light even if the paper should become crumpled or run crooked. 1t will, of course, be understood that the pendulum device shown at the right in Fig. 1 is intended to illustrate the same pendulum device that is shown at the left-hand side in Fig. 1, but in another position, which is the valve` closing position.

1t is evident that when the machine stops or comes to rest the valve 1 is shut and the gas is turned 0E and that so long as there is proper relative motion between the material bein subjected tothe flame, and the flame itsel the valve 1 is open and the gas is turned on. rllhe spring 6, is an example of means for closing the valve, and the pendulum mechanism is an example of means responsive to the proper relative motion of the flame and material acted upon by it, and adapted to restrain the closing action of the spring so long as the machine is running properly or bringing about such relative motion and to permit of such automatic closing and turning ofi' of the gas at all other times.

llt will be evident to those skilled in the art that modifications may be made in details of construction and arrangement so that the invention is not limited as to those matters or in any Way other than the prior state of the art and the appended claims may require.

Vhat I claim is:

l. An automatic shut-off for dispelling gas-burners comprising the combination of a gas valve, a pendulum, and a cam mechanism interposed between the valve and pendulum and adapted to open and keep open the valve during a part of the swing of the pendulum and to close the valve in all other positions of the pendulum.

2. An automatic shut-off for gas burners comprising the combination of a reciprocating carriage, a gas valve, and a pendulum traveling with the carriage and operatively connected with the valve to close the same upon stoppage of the carriage.

In an automatic shut-offl for gas burners the combination of a reciprocating carriage, a gas valve, a pendulum traveling with the carriage and operatively connected with the valve7 and a stop for limiting the swing of the pendulum in one direction.

4. An automatic shut-ofil for gas burners comprising the combination of a main burner, a pilot light, a main burner valve, a reciprocating carriage, and a pendulum traveling with the carriage and operatively connected With the main burner valve.

5. An automatic shut-off for dispelling gas-burners comprising the combination of a main burner, a gas-Way fitting connected therewith, a normally closed puppet valve arranged in the gas-Way fitting, a cam shaft freely rotatable in respect to the gas-Way iittin and provided with a valve, a pendu` lum reely mounted on said shaft, and means for adjustably connecting the pendulum and shaft to provide for change in the angular relation of the cam and pendulum, substantially 'as described.

WILLIAM MUSGRAVE WOOD. 

